Liquid crystal display is composed of shell, driving kit and liquid crystal panel. The shell will not affect the work, so the maintenance process: check whether the driver kit is broken or the LCD panel is broken before starting the machine.

First, the driver kit detects whether the power supply part is broken or the driver part is broken.

1. In the power supply section, carefully check each transformer rectifier module. There are at least 10 common faults that may lead to a blank screen, and at least 10 maintenance, some of which are superimposed on each other.

2. There are fewer drivers, the common decoding chip is broken, the MCU program is lost, and other common components are damaged.

Second, the LCD panel detects whether the backlight part is bad or the imaging part is bad.

1. There are many faults in the backlight part that cause the backlight not to light up. If the parameter specification of this screen is "Normal Black", it will also be black.

2. The imaging part, which is often referred to as the glass circuit part, is divided into T-CON, edge plate, film block and glass ITO, and each part has more than five common faults that will cause black screen.